Single-roll grinding mill



SINGLE ROLL GRINDING MILL Filed Jan. 21, 1953 2 Sheets-Sheet l NOV. 28,1933. Q SODER 1,936,972

SINGLE ROLL GRINDING MILL Filed Jan. 21, 1933 I 2 Sheets-Sheet 2Patented Nov. 28,1933 V I 'U D S S i 'I V 1,936,9'12 I I I i OscarSeder, Niederlen z; switierland 1 Application January 21, 1933,Seria1.-No. 652,884,

and in Germany February Z, .1932

- Claims. (01. 83514) r This invention relates to single-roll grindingleverarm, the grinding pressure can be very mills wherein arollcooperates with a counter quicklyset to the required value in teveryseotion member secured on a swirigable carrier member of themilland controlled atza y m t and urged against the roll, through an interhmp nyin dr win s a c n r c- J8 vening lever system, by means of a weightdistionail form of 'fi is illustrated; by 60 plaeeamy arranged on alever am; i Ofexample y, i which I i Heretofore, in mills of this type,the lever arm 1 Shows all, elevatiolrof a g el milll, carrying theweight was inclined to'the horizon- 2 s a c o s sect o of the ill,- atal which inclination varied with the wear on Fi 3 is a view or a detailof Fig. 1 one lar r the counter member increasing. Due to, this scale,and I i t 65" variation of the inclination of the lever arm the g 4 isa'section 0n 'fih I inFlggrinding pressure between the counter memberReferring to t drawingsnl r p n 1113116 and the grindingroll is'alsochangeable, so that grind-mg 1? the counter i e I with such anarrangement it is necessary to grinding speoowhiclitapersiniho-direotion o r 715 readjust the weight along the lengthof thelerotation the roll- 'By'subdividing' n 710 ver arm for'obtaining thesamegrinding presmember, Several sections of thomillare m d sure withiiiirereiit'ineiinations of this arm. Fura disposed i e by side. In Fig.1' only-the thermore, with this construction it is impossible s andlastisections' are completelysh w nto read off the magnitude of thegrinding presindicated by the do -s d r sure with the aid of a scale onthe lever arm, as ing r011 1,.which' maybe common to allsec- 75 thedivisions oi the scale could only be adapted time, isumounted on shaft'ewhich actuated "to a certain inclination. of the lever arm andbyimeansof a'pulley 9 member with any other inclination the indicationsof is pivotallyarranged on a pin-7. fasten d to acerthe scale wereerroneous. Therefore, as; with Tier 3 can be fixed thereon by tighteningthe known mills of this type the adjustment'of a theniitso of the pin ii r t i i s of i e so constant grinding pressure of an exactpredeterjustment relatively to the gr nding ro1l.; For-as:-minedimagnitude is impossible the'lgnown mills s 'sting in adjustin t rd spa eBw y were incapable of yielding a product of a certain means i olm 2, a Set --screw 9- fineness of grinding and conseguentlyjwere not dd'o the carnerarm. "T garner v pre'eisibn device-S; I arms 6 are linkedwith their lower-endstoa aeeording'to the invention these drawbacksshaft 11 mountedi bearings j d are eliminated in the mill by prj vidingan exupper ends 6" of 'thecarrier arms are provided tensibleintermediate memberjforengaging the with incisions rr s t l-b e -s i souter end .of the carrier .arm in a disposition of a cvlossheadi T h e td v '35 approximately perpendicular to said ar and on'an adjustingsleeve, 13 provided withfa con-" connected to thelever arm carrying theweight, F 0 disc 4 and'screwed-on a rod 1 'aS t0 the arrangement beingsuch, th t th d lever be; adjustable on the'rod 15 by correspondinglyarm isadapted to be set with'respectto a"contuifiifig the disc 1 f g dtrol stop member in substantially horizontal y shciuldels 011 the fl Jfl SleeVeTfor oup ing 40 position by adjusting the. intermediate'memb'er these two parts for common movement, Therod V This arrangementpermits that inanyjcon'dition 15 is pivotallyoonnected to'a crank arm'16 which of wear of the counter member the lever .arm is secured onapivot pin l'lwhich ismounted'in carrying the weight can be adjustedtooccupy a abearingsuppOrt-IS andfixed with its other-end horizontalpositionby adjustingthe intermediate to a lever arm 19"(Fig; 4) 'On thelever arm 45 member. In this manner, by displacing the 19 'a" weight 20is displaceably arranged and weight along a scale on the lever arm, acertain adapted to cooperate, by meansof a handl'e pie'cegrindingpressure canbe invariably set and con 20,with notches 21forfdefinite-adju'st'ment' into A trolled at any time. differentpositions on the lever arm19. iBy ac- This device is particularlyadvantageous for tion of'the weight 20' the counter member 2 is 50:mills wherein, by subdividing the counter mempressed against thegrindihgroll 1 throughfthe 10s Joer, severalsections' are formed,-as'insuch mills intermediary of pivot 'pin 17, rod 15, arm- 16, each countermember of the various sections is and carrier arm' fi the magnitude ofthispressure differently" loaded and' separately adjusted. beingregulatable-by shiftin'gthe. Wei t 1 'Thuswith themill, according'to theinvention, the lever arm 19. To a projection '18 on the 5 by shiftingthe weight along the scale on the bearing support 18 a carrier bar"22'is'se'cu'red' through the end of which a set screw 23 is screwedwhich serves for supporting the lever. arm 19, when the feed of stockmaterial is discontinued. Ihe lever arm 19 is rearwardly prolongedbeyond its fulcrum to project with an arm 19' into the interior of thecasing 24 of the machine, Where it is provided with a bearing face whichcooperates with a-cam. disc 25 on a shaft'25. By turning a hand crank 26connected to the end of the shaft 25, cam disc 25, lever arm 19 andvtheweight together with it can be raised for retracting the counter member2 from the grinding The lever arm '19 is thus held in the mill severaldifferent stock material each of which requires a special. grindingpressure, so that for example the first section is to be set toapressure of 80 grams per square centimeter, the'second'secroll 1. raisedposition by the camwiththe grinding member relieved from the influenceoi the counterweight. I 'Above the grinding space '3of eachsection ofthe mill, a pair of auxiliary rolls 27; 28 for coarse comminution of thegoods that are admitted to 28 has; its bearings in a housing 32-which islinked'to-thecasing2e by means of a shaft 33. A screw spindle- 36provided with a hand wheel and threadedly connectedto a stirrup 38 whichisswingably arranged on a pin 37, isadapted to exert pressure ona'projection 34 on the housing 32. In' this manner the grinding pressurebetween the rolls 27, 28'can be adjusted by means of thehand wheel 35.The stationary rolls 2''! are carried by a common shaft 39 which isdriven from'the main drive shaft by means of a belt drive including thepulleys 40 and 4:1. The adjustable rolls 28 partake of the rotationalmovement by action of the grinding pressure. As to each mill section aseparate pair'of rolls 2'2, 28 is correlated and'oneroll of each. pairis accommodated in a separate housing, the grinding pressure betweenevery pair can be set for each mill section separately and independentlyof the'other sections to any desired value. This is of particular'advantage, when through the same mill a larger number of portions of thesame amount of stock material are fed in parallel; On the other hand itis obvious that the mill is also greater grinding pressure is effectedalong a line bearing between the pair of rolls'27, 28. ,.Whilst.,between this pair the branny material is flattened out, in the grindingspace only a sizing of the bran particles takes place without asimultaneous'grate ing effect. In this manner heat production in thegrinding space is considerably diminished which also results ina savingof power consumption of 'themill. 1,

The specific pressure arising between the counter member 2 and thegrinding roll 1, which is characteristic for the fineness ofgrinding,-"can be read on a scale on the'guide track of the lever arm19.: The divisions of'this scale may be; so chosen thatreading off theabsolute value of the specific pressure is rendered possible. With thisarrangementfor the counter weight the specific pressure remains.constant evenawith fluctuations in the feed of the material andexpansions due to heat in-the grinding elements arising.

; thelever arm 19 bears against the-same-when the feed of stock isdiscontinued. .Thereupon, the

grinding space 3. an b opened the maximum amount or set for any desiredsizing by means of the control disc 14, in such manner, that thegrinding surfaces contact but slightly or not at,

all. A slight contactis most advantageous for a proper grindingoperation andat the same time no detrimental effects are exercised onthe grinding other. On the continuation of the feed the grindingpressure sets in automatically and immediately reassumes itspredetermined value. 1

When itiisintended to pass through the same tion to 60 grams, the, thirdsection to 40 grams, and the f0l1I"h-SLClJiO11 to '70 grams and soforth, the counter weights can be readily adjusted to the respectivepositions and? the pressure con-1 trolled any time. I V

By raising the rod 15, the bearing studs of'the cross head 12 can beremoved from the incisions of the carrier arm 6 whereafter the carrierarm is adapted to be swung out of operativeposition together with thecountermember 2 even during therun ofthemill. The position-of thecounter member 2 relatively to the grindin'g roll 1 can be preciselyadjusted by means of the set screw 9-. Aside from this, thecounter.member is readily exchangeable at any time by loosening the nuts 8 onthe pin 7. Furthermore, the carrier arm is so mounted on the shaft llthat it may be readily taken on" the shaft without shifting thesame. 7

By means of the hand crank 26 all the counter members 20f the mill areadaptedto be simultaneously released. 0n the other handeach countermemberf2 is adaptedtobe separately rendered inoperative either byrotationally displacing the control disc 14 'or by raisingandtemporarily lockirig the leverarrn 19 carrying the weight 20 in V thethus retractedposition.

. The described device for settingthe grinding pressure including theadjustable and retractible' counter weight is applicable to anygrindingmill comprisin grating working faces, irrespective'ofthepresence .of means for coarse comminution. j 1. I donot limit myselfto the particular size,

shape, number or arrangement of parts as shown described, all of whichmay be' varied without going beyond the scope of my invention as shown,

described and claimed.

WhatIclairn'is: V q 1. In a grinding'mill of the type described, incombination, a, grinding roll, a counter grinding member for saidgrinding roll, a leversystem conj and extending substantiallyperpendicularlyto said carrier arm, and: means for adjusting the lengthof said extensiblemember for setting said lever arm with theaid of saidcontrol stop into that predetermined substantially horizontal posie Ition which corresponds. to

the desired grinding P e sure.

2'. In a grinding mill of the type described; combination, a grindingroll, a counter ing member for said grindingroll, a lever syn ternconnected with said counter grinding mermber, a 1ever arm of said systemlinked to the; casing of the millat the end of said system op-- positeto said grinding member, a pivot secured. to said lever arm, a crank armsecured to said; pivot of said lever arm, a. control stop for saidi1ever arm for supporting the same in a substantially horizontaldisposition, a counterweight; displaceably arranged on said 1ever armfor regulating the grinding pressure between said. grinding roll andsaid counter grinding mem-- her, a pivotal carrier arm of said systemfor said. counter grinding member, an extensible member linked with oneend to said crank arm and with.

the other end to the outer end of said pivotal. carrier arm andextending substantially perpendicularlyto said carrier arm, and meansfor ad.-

'usting the length of said extensible member for setting said lever armwith the aid of'said. control stop into that predetermined substan--tially horizontal position which corresponds to) the desired grindingpressure. 7

3. In a grinding mill, of the type described, in;

combination, a grinding roll, a counter grinding member for saidgrinding roll, a lever system connected with said counter grindingmember, a le-- ver arm of said system linked to the casing off the millat the end of said system opposite to saidi grinding member, a pivotsecured to said leverarm, a crank arm secured to said pivot; of! saidlever arm, a control stop for said lever arm: for supporting the same ina substantially horizon.- tal disposition, a counter weight displaeeahly arranged on said lever arm for regulating: the grindingpressurebetween said grinding roll and said counter grinding member, apivotal carmer arm of said system for said counter grinding? member, aslotted outer end of said carrier am, an extensible member linked withone end to said! crank arm, a rotatable part of said extensible memberthreadedly connected to the other end of its body, a orosshead mountedfor rotation said rotatable member, lateral bearing studs provided onsaid crosshead for engagement in said Slotted outer end of said carrierarm in a sub. stantially perpendicular disposition to said carrier arm,and coupling means arranged between said crosshead and saidrotatable'inember for common shifting movement of these parts on thebodyv of said extensible member on rotational displacement'of saidrotatable member for ad justing the length of said extensible memberfor' setting said lever arm with the aid of said control stop into thatpredetermined Substantially :mined substantially horizontal positionwhich horizontal position which corresponds tothe: 'desired' grindingpressure. e

I 4. In a grinding mill of the type described, in combination, agrinding roll, a counter grinding :member for said grinding roll, alever system connected with said counter grinding member, a. 1ever armof said system linked to the casing of? the 'millat the end of saidsystem'opposite to said grinding member, a control stop for said Ileverarm for supporting the same in a substan-- tially horizontaldisposition, a counterweight displaceably arranged on said leverarmi'orregulating the grinding pressure between said grind-- -;ing rolland said'counter grinding member, a :rearward arm of said lever armprojectingbeiyond the fulcrum of the latter, a cam disc 00-' operatingwith said. rearward arm of said lever :arm for raising the latter andholding the same with the counter grinding member relieved from carrierarm of said system for said counter -grinding member, an extensiblemember inter- -calated between the outer end of said pivotal carrier armand said lever arm and extending substantially perpendicularly to saidcarrier arm, :and means for adjusting the lengthof said ex- 'tensiblemember for setting said lever arm with the aid-of said control stop intothat predetercorresponds to the desired grinding pressure.

5. In a grinding mill of the type described, in combination, a grindingroll, a counter grinding member for said grinding roll, a lever systemcon-.-

nected with said counter grinding member, a lever arm of said systemlinked to the casing of the mill at the end of. said system opposite to.said grinding member, a control stop for said 1ever arm for supportingthe same in a substantially horizontal disposition, a counterweightdisplaceably arranged on said lever armfor reg- 'ulating the grindingpressure between said grinding roll and said counter grinding member, apivotal carrier arm of said system for said counter grinding member, adetachableconnection arranged between said carrier arm and said grindingmember, adapting relative adjustment .of the latter to said grindingroll, an extensible member intercalatedbetween the outer end of saidpivotal carrier arm and said lever arm and extending substantiallyperpendicularly to said carrier arm, and means for adjusting the lengthof said extensible member for setting said 1ever arm with the aid ofsaid control stop into that predetermined substantially horizontal po-',sition which corresponds to the desired grinding pre'mure' I OSCAR SODER.

